Holds the style parameters used on the "Previous page" paging control button shown by default on the GallerySelector element if no custom PagingControls descriptor has been defined.
This class does not actually exist for any practical purposes; instead, it is used to document the available GalleryPagingPreviousButton style values which can be applied in the <styles> section
of the XML configuration file.

Style XML Implementation Example:

The following example code goes in the <styles> section of the main <slideshow> holder node in a slideshow XML configuration file.

The GalleryPagingPreviousButton class inherits all of the style tag attributes of its superclass.

A convenience method for determining the unscaled width
of the component
All of a component's drawing and child layout should be done
within a bounding rectangle of this width, which is also passed
as an argument to updateDisplayList().

Measures the specified HTML text, which may contain HTML tags such
as <font> and <b>,
assuming that it is displayed
in a single-line UITextField using a UITextFormat
determined by the styles of this UIComponent.

Validates the measured size of the component
If the LayoutManager.invalidateSize() method is called with
this ILayoutManagerClient, then the validateSize() method
is called when it's time to do measurements.

Dispatched by the drag initiator (the component that is the source
of the data being dragged) when the drag operation completes,
either when you drop the dragged data onto a drop target or when you end
the drag-and-drop operation without performing a drop.